Pump jack



W. C. REESE.

PUMP JACK. APPLICATION FILED mun, 1921.

1 1 9& men June 2% 1922 UNHT STATS eater are,

PUMP JACK.

Specification of Letters Patent.

Patented June 28, 1922.

Application filed July 11, 1921. Serial No. 483,786.

To all whom it may concern:

Be it known that I, VILLIAM C. REESE, a citizen of the United States, residing at Hayes Center, in the county of Hayes and State of Nebraska, have invented a certain new and useful Improvement in Pump Jacks, of which the following is a complete specification.

This invention relates to pump jacks, and my object is to produce a pump jack which may be mounted in any desired position, but preferably on the ground or well platform in close proximity to the pump.

Another object is to produce a pump jack of such a character that two reciprocating movements will be imparted to the pump upon each revolution of the drive wheel.

A further object is to produce a self-oiling pump jack and one which has no complicated or intricate parts demanding expert attention.

A still-further object is to produce a pump jack of small and compact size and which may be readily installed and set up by an inexperienced workman.

A still further object is to produce a device of this character of simple, strong, durable, efiicient, and inexpensive construction; and in order that it may be fully understood, reference is to be had to the accompanying drawing, in which Figure 1, is a side elevation with the housing of the jack in central vertical section, and illustrates the jack-in operative relation to a pump.

Figure 2, is a' section on the line II-I1 of Figure 1.

Figure 3, is a perspective view of the power lever of the jack.

Figure 4, is an enlarged section on the line IV-IV of Figure 1.

In the said drawing, where like reference characters identify corresponding parts in all of the figures, 1 is a pump jack casing of rectangular form with an arched top or cap, and is adapted to be bolted to or secured in any suitable manner to the ground or well platform G. Journaled in the arched top of said casing on a pair of trunnions 2 1s a worm wheel 3 which meshes with a worm 4 keyed on a horizontal shaft 5 which extends exteriorly of the casing and is journaled 1n said casing on an upstanding bearing 6 formed integrally with the bottom of the casing.

The exterior end of the shaft 5 is equipped with a drive pulley 7 of any suitable character and is adapted to be driven by a belt not shown), leading from any suitable source of power.

. Projecting from opposite faces of the worm wheel 3 at diametrically opposite points are two pairs of pins 8 and 9, equipped with anti-friction rollers 10 for a purpose which will hereinafter appear.

A lever 11 formed at its opposite ends with bifurcated extensions 12 and 13 for a purpose which will hereinafter appear, is pivoted on a pin 14 mounted in a pair of ears 15-formed at one side of casing 1. Extensions 12 of said lever extend interiorly of the casing and extensions 13 exteriorly thereof, The extremities of extensions 13 are provided with a series of perforations which allow for adjustments to the stroke of the lever and are pivotally connected by links 16 to the pump plunger 17 extending downwardly within the pump casing P, as customary in installations of this character.

In order to translate the rotation of wheel 3 into reciprocating movement and, at the same time, impart two reciprocations to the pump plunger for each revolution of the worm wheel, extensions 12 are formed on their inner faces with grooves 18 opening upwardly at their opposite ends and adapted to be alternately engaged by the pins 8 and 9, carried by the worm wheel 3, as will be readily understood. It will be noticed that the arrangements of the extensions 12 ,are such that they will lie slightly below the horizontal axis of the .worm wheel 3 when in elevated position and that, therefore, the operation of the pump will be halted for an instant after a pin passes out of a groove 18,

before the other pin will enter the corresponding groove.

By referring to Figure 1 it will be noticed that in their downward movement, extensions 12 will immerse their ends in oil 0, placed in the bottom of the casing, and that upontheir upward travel, a certain quantity of thls oil will be carried up into grooves 18 z and will splash to the bearings of the wheel and the other operative parts.

In operation the wheel turns in the direction indicated by the arrow, both pins imparting a complete up and down stroke to the pump plunger, it also being noted that in the swinging of the lever, the extensions 12 are not interfered with by the worm shaft and bearings therefor as said parts lie dim an:

rectly under the Wheel occupying a space which in width is narrower than the space between said extensions,

From the above description it will be apparent that I have produced a device of the character described which possesses all of the features of advantage pointed out as desirable, and while I have described and claimed the preferred embodiment of the same, I reserve the right to all changes properly falling within the spirit and scope of the appended claims.

I claim:

1. A. pump jack comprising a casing, a Wheel journaled in said casing, a lever pivoted in said casing and adapted to have pivotal connection at one end with a pump and provided with a pair of grooves at its other end at opposite sides of said Wheel, and a pair of pins carried by said wheel at opposite sides thereof, and adapted to alternately engage their respective grooves.

2. A pump jack comprising a casing, a

driven wheel journaled in said cas 1ng, a lever pivoted in said casing and having its opposite ends bifurcated and being pivotally connected'at one end to a pump and at its other end receiving the wheel, said lever having a pair of longitudinal grooves, and'a pair of pins carried by said wheel at its opposite sides and adapted to pass through their respective grooves of the lever alternately and each actuate the lever in two directions. I

3. A pump jack comprising a casing formin an oil .chamber, a wheel journaled in said casing, a lever pivoted in said casing and having its opposite ends bifurcated, said lever having a pivotal connection at one end with a pump, its other bifurcated end receiving the Wheel and being provided with a palr of grooves, pins carried by said wheel and adapted to alternately engage said groove, and impart oscillation to said lever to operate the pump and distribute oil for lubrication purposes within the casing, and means carried by said casing for imparting rotation to said wheel.

In witness whereof I hereunto aiiix my signature. 

